loop0: detected capacity change from 0 to 65536 XFS (loop0): Mounting V5 Filesystem 9b7348e5-2fa0-41a5-9526-c53a678b01f3 XFS (loop0): Ending clean mount XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. loop0: detected capacity change from 65536 to 65414 XFS (loop0): Metadata CRC error detected at xfs_agf_read_verify+0x16a/0x240 fs/xfs/libxfs/xfs_alloc.c:3325, xfs_agf block 0x8001 XFS (loop0): Unmount and run xfs_repair XFS (loop0): First 128 bytes of corrupted metadata buffer: 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ XFS (loop0): metadata I/O error in "xfs_read_agf+0x2dc/0x630" at daddr 0x8001 len 1 error 74 XFS (loop0): Metadata CRC error detected at xfs_agf_read_verify+0x16a/0x240 fs/xfs/libxfs/xfs_alloc.c:3325, xfs_agf block 0x8001 XFS (loop0): Unmount and run xfs_repair XFS (loop0): First 128 bytes of corrupted metadata buffer: 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ XFS (loop0): metadata I/O error in "xfs_read_agf+0x2dc/0x630" at daddr 0x8001 len 1 error 74 XFS (loop0): page discard on page ffffea0001519240, inode 0x2c, pos 0. ====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc7-syzkaller-00186-gd07de43e3f05 #0 Not tainted ------------------------------------------------------ syz.0.0/5326 is trying to acquire lock: ffff88804513e018 (&xfs_dir_ilock_class){++++}-{4:4}, at: xfs_reclaim_inode fs/xfs/xfs_icache.c:1037 [inline] ffff88804513e018 (&xfs_dir_ilock_class){++++}-{4:4}, at: xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1729 [inline] ffff88804513e018 (&xfs_dir_ilock_class){++++}-{4:4}, at: xfs_icwalk_ag+0x1211/0x1ac0 fs/xfs/xfs_icache.c:1811 but task is already holding lock: ffffffff8ec3a6c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3926 [inline] ffffffff8ec3a6c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3951 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (fs_reclaim){+.+.}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __fs_reclaim_acquire mm/page_alloc.c:3853 [inline] fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3867 might_alloc include/linux/sched/mm.h:318 [inline] slab_pre_alloc_hook mm/slub.c:4066 [inline] slab_alloc_node mm/slub.c:4144 [inline] kmem_cache_alloc_node_noprof+0x48/0x380 mm/slub.c:4216 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:596 alloc_skb include/linux/skbuff.h:1331 [inline] alloc_uevent_skb+0x74/0x230 lib/kobject_uevent.c:289 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] kobject_uevent_net_broadcast+0x2fd/0x580 lib/kobject_uevent.c:410 kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:608 kobject_synth_uevent+0x4ef/0xae0 lib/kobject_uevent.c:207 bus_uevent_store+0x116/0x170 drivers/base/bus.c:832 kernfs_fop_write_iter+0x3a0/0x500 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xacf/0xd10 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (uevent_sock_mutex){+.+.}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730 uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline] kobject_uevent_net_broadcast+0x280/0x580 lib/kobject_uevent.c:410 kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:608 set_capacity_and_notify+0x265/0x2d0 block/genhd.c:102 loop_set_size drivers/block/loop.c:234 [inline] loop_set_status+0x496/0x800 drivers/block/loop.c:1292 lo_ioctl+0xce6/0x2870 blkdev_ioctl+0x5d0/0x6f0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&q->q_usage_counter(io)#17){++++}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 bio_queue_enter block/blk.h:78 [inline] blk_mq_submit_bio+0x14e1/0x25d0 block/blk-mq.c:3091 __submit_bio+0x2cf/0x6a0 block/blk-core.c:628 __submit_bio_noacct_mq block/blk-core.c:715 [inline] submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:744 xlog_state_release_iclog+0x41d/0x7b0 fs/xfs/xfs_log.c:567 xlog_force_iclog fs/xfs/xfs_log.c:802 [inline] xlog_force_and_check_iclog fs/xfs/xfs_log.c:2864 [inline] xfs_log_force+0x616/0x960 fs/xfs/xfs_log.c:2941 xfs_qm_dqflush+0x9ae/0x1130 fs/xfs/xfs_dquot.c:1463 xfs_qm_flush_one+0x295/0x490 fs/xfs/xfs_qm.c:1537 xfs_qm_dquot_walk+0x232/0x4a0 fs/xfs/xfs_qm.c:90 xfs_qm_quotacheck+0x41a/0x6f0 fs/xfs/xfs_qm.c:1625 xfs_qm_mount_quotas+0x38f/0x680 fs/xfs/xfs_qm.c:1739 xfs_mountfs+0x1f3d/0x2500 fs/xfs/xfs_mount.c:1041 xfs_fs_fill_super+0x1223/0x1550 fs/xfs/xfs_super.c:1817 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&xfs_dquot_project_class){+.+.}-{4:4}: reacquire_held_locks+0x3eb/0x690 kernel/locking/lockdep.c:5376 __lock_release kernel/locking/lockdep.c:5565 [inline] lock_release+0x396/0xa30 kernel/locking/lockdep.c:5872 __mutex_unlock_slowpath+0xec/0x800 kernel/locking/mutex.c:891 xfs_qm_dqget_cache_lookup+0x340/0x8b0 fs/xfs/xfs_dquot.c:829 xfs_qm_dqget_inode+0x308/0xb40 fs/xfs/xfs_dquot.c:1022 xfs_qm_dqattach_one+0x17d/0x610 fs/xfs/xfs_qm.c:320 xfs_qm_dqattach_locked+0x476/0x530 fs/xfs/xfs_qm.c:390 xfs_qm_vop_dqalloc+0x3fd/0xef0 fs/xfs/xfs_qm.c:1978 xfs_icreate_dqalloc+0x311/0x360 fs/xfs/xfs_inode.c:643 xfs_create+0x4be/0xf50 fs/xfs/xfs_inode.c:678 xfs_generic_create+0x5d5/0xf50 fs/xfs/xfs_iops.c:215 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4313 do_mkdirat+0x264/0x3a0 fs/namei.c:4336 __do_sys_mkdirat fs/namei.c:4351 [inline] __se_sys_mkdirat fs/namei.c:4349 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4349 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&xfs_dir_ilock_class){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_write_nested+0xa2/0x220 kernel/locking/rwsem.c:1693 xfs_reclaim_inode fs/xfs/xfs_icache.c:1037 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1729 [inline] xfs_icwalk_ag+0x1211/0x1ac0 fs/xfs/xfs_icache.c:1811 xfs_icwalk fs/xfs/xfs_icache.c:1859 [inline] xfs_reclaim_inodes_nr+0x2b0/0x390 fs/xfs/xfs_icache.c:1103 super_cache_scan+0x40f/0x4b0 fs/super.c:227 do_shrink_slab+0x72d/0x1160 mm/shrinker.c:437 shrink_slab+0x1093/0x14d0 mm/shrinker.c:664 shrink_one+0x43b/0x850 mm/vmscan.c:4868 shrink_many mm/vmscan.c:4929 [inline] lru_gen_shrink_node mm/vmscan.c:5007 [inline] shrink_node+0x379b/0x3e20 mm/vmscan.c:5978 shrink_zones mm/vmscan.c:6237 [inline] do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6299 try_to_free_pages+0x47c/0x1050 mm/vmscan.c:6549 __perform_reclaim mm/page_alloc.c:3929 [inline] __alloc_pages_direct_reclaim+0x178/0x3c0 mm/page_alloc.c:3951 __alloc_pages_slowpath+0x807/0x10b0 mm/page_alloc.c:4383 __alloc_frozen_pages_noprof+0x49b/0x710 mm/page_alloc.c:4753 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 folio_alloc_mpol_noprof mm/mempolicy.c:2289 [inline] vma_alloc_folio_noprof+0x12b/0x260 mm/mempolicy.c:2324 folio_prealloc+0x2e/0x170 alloc_anon_folio mm/memory.c:4834 [inline] do_anonymous_page mm/memory.c:4891 [inline] do_pte_missing mm/memory.c:4057 [inline] handle_pte_fault mm/memory.c:5888 [inline] __handle_mm_fault+0x32e6/0x6ef0 mm/memory.c:6031 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6200 faultin_page mm/gup.c:1196 [inline] __get_user_pages+0x1a92/0x4140 mm/gup.c:1491 populate_vma_page_range+0x264/0x330 mm/gup.c:1929 __mm_populate+0x27a/0x460 mm/gup.c:2032 mm_populate include/linux/mm.h:3392 [inline] vm_mmap_pgoff+0x38e/0x530 mm/util.c:583 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &xfs_dir_ilock_class --> uevent_sock_mutex --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(uevent_sock_mutex); lock(fs_reclaim); lock(&xfs_dir_ilock_class); *** DEADLOCK *** 3 locks held by syz.0.0/5326: #0: ffff888011dc3de0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:190 [inline] #0: ffff888011dc3de0 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x1b0/0x460 mm/gup.c:2011 #1: ffffffff8ec3a6c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3926 [inline] #1: ffffffff8ec3a6c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3951 #2: ffff888040a820e0 (&type->s_umount_key#49){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:562 [inline] #2: ffff888040a820e0 (&type->s_umount_key#49){.+.+}-{4:4}, at: super_cache_scan+0x94/0x4b0 fs/super.c:196 stack backtrace: CPU: 0 UID: 0 PID: 5326 Comm: syz.0.0 Not tainted 6.14.0-rc7-syzkaller-00186-gd07de43e3f05 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_write_nested+0xa2/0x220 kernel/locking/rwsem.c:1693 xfs_reclaim_inode fs/xfs/xfs_icache.c:1037 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1729 [inline] xfs_icwalk_ag+0x1211/0x1ac0 fs/xfs/xfs_icache.c:1811 xfs_icwalk fs/xfs/xfs_icache.c:1859 [inline] xfs_reclaim_inodes_nr+0x2b0/0x390 fs/xfs/xfs_icache.c:1103 super_cache_scan+0x40f/0x4b0 fs/super.c:227 do_shrink_slab+0x72d/0x1160 mm/shrinker.c:437 shrink_slab+0x1093/0x14d0 mm/shrinker.c:664 shrink_one+0x43b/0x850 mm/vmscan.c:4868 shrink_many mm/vmscan.c:4929 [inline] lru_gen_shrink_node mm/vmscan.c:5007 [inline] shrink_node+0x379b/0x3e20 mm/vmscan.c:5978 shrink_zones mm/vmscan.c:6237 [inline] do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6299 try_to_free_pages+0x47c/0x1050 mm/vmscan.c:6549 __perform_reclaim mm/page_alloc.c:3929 [inline] __alloc_pages_direct_reclaim+0x178/0x3c0 mm/page_alloc.c:3951 __alloc_pages_slowpath+0x807/0x10b0 mm/page_alloc.c:4383 __alloc_frozen_pages_noprof+0x49b/0x710 mm/page_alloc.c:4753 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 folio_alloc_mpol_noprof mm/mempolicy.c:2289 [inline] vma_alloc_folio_noprof+0x12b/0x260 mm/mempolicy.c:2324 folio_prealloc+0x2e/0x170 alloc_anon_folio mm/memory.c:4834 [inline] do_anonymous_page mm/memory.c:4891 [inline] do_pte_missing mm/memory.c:4057 [inline] handle_pte_fault mm/memory.c:5888 [inline] __handle_mm_fault+0x32e6/0x6ef0 mm/memory.c:6031 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6200 faultin_page mm/gup.c:1196 [inline] __get_user_pages+0x1a92/0x4140 mm/gup.c:1491 populate_vma_page_range+0x264/0x330 mm/gup.c:1929 __mm_populate+0x27a/0x460 mm/gup.c:2032 mm_populate include/linux/mm.h:3392 [inline] vm_mmap_pgoff+0x38e/0x530 mm/util.c:583 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4523d8d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4524c00038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f4523fa5fa0 RCX: 00007f4523d8d169 RDX: 000000000300000e RSI: 0000000000b36000 RDI: 0000200000000000 RBP: 00007f4523e0e2a0 R08: ffffffffffffffff R09: 0000000000000000 R10: 20c44fb6edc09a38 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4523fa5fa0 R15: 00007ffffd1c3038 syz.0.0 (5326) used greatest stack depth: 18352 bytes left